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y = anak
x - y = 26
(x - 5) + (y - 5) = 34
x + y - 10 = 34
x + y = 44
x - y = 26
x + y = 44
------------------- +
2x = 70
x = 35 tahun
35 + y = 44
y = 44 - 35 = 9 tahun
umur anak = b
a - b = 26
(a - 5) + (b - 5) = 34
a + b = 44
eliminasi:
a - b = 26
a + b = 44
_________ +
2a = 70
a = 35
b = 9
umur ayah = 35 tahun dan umur anak = 9 tahun